diff --git a/py-kms/pykms_Server.py b/py-kms/pykms_Server.py
index 0f9e04a..2b6e42a 100755
--- a/py-kms/pykms_Server.py
+++ b/py-kms/pykms_Server.py
@@ -220,7 +220,7 @@ Use \"STDOUTOFF\" to disable stdout messages. Use \"FILEOFF\" if you not want to
         'reuse'      : {'help' : 'Do not allows binding / listening to the same address and port. Reusing port is activated by default.', 'def' : True,
                         'des': "reuse"},
         'dual'       : {'help' : 'Allows listening to an IPv6 address also accepting connections via IPv4. Deactivated by default.',
-                        'def' : False, 'des': "dual"}
+                        'def' : True, 'des': "dual"}
         }
 
 def server_options():